Our body and its appearance are anatomically asymmetrical. Occasionally, the exact symmetry thus cannot be achieved with fillers; however, asymmetry can occur due to a different reaction of the body on one side. Correction of asymmetry can require additiona injections of hyaluronic acid.
After the application, the skin is more sensitive to external factors on this sites (heat, cold, UV light). Therefore, it needs to be protected from them for a few more days after the application.
During the application of hyaluronic acid or local anaesthetic, temporary or permanent damage of deeper structures – veins and nerves – can occur. Tissue infections after the application of hyaluronic acid are very rare (less than 1 in 1.000 cases). Nevertheless, bacterial as well as viral and fungal infections can occur. Herpes can also occur (even in patients who never had it before). In persons with common herpetic infections, preventive antiviral medications can be prescribed. Any kind of infection can require additional treatment with antimicrobial medications and surgical procedures as well. This complication can cause permanently visible scar on the skin and in the subcutaneous tissue.
Necrosis is extremely rare complication which can cause visible scars and the need for additional surgical treatment.
Like any biological substance, hyaluronic acid can also cause allergic reaction, in the most severe cases even shock and death. Such reaction can also be a consequence of an allergy to the local anaesthetic.
After the application of hyaluronic acid, painful tightening of the subcutaneous tissue can occur rarely which can require additional treatment and surgical procedures.